What were the first organisms to have sex? We may never know the answer, but as Bill Nye explains in this Big Think interview, scientists are very interested in why sexual activity remains so popular in nature...

November 19: Denver, Book Talk at the Tattered Cover - if you are in Denver for MESA or just live there come out to hear the amazing writer Mark Bowden talk about his new book on the killing of Osama bin Laden and stay to listen to me talk about Yemen.